Hack saw



G. T. PARSLEY.

HACK SAW. APPLICATION FILED JUNE 9,192].

1,41 8,348, I Patented AprQlS, 1922.

FIG. 6.

IIVVENTOR G. 7. PARSLEX 8) FIG. 9.

UNITED STATES PATENT OFFICE.

GEORGE T. PARSLEY, OF ASHLAND, OREGON.

HACK SAW.

To all whom it may concern:

Be it known that I, GEORGE T. PARSLEY, a citizen of the United States, and resident of Ashland. county of Jackson, and State of Oregon, have invented a new and useful Hack Saw, of which the following is a specification.

The present invention relates to improvements in hacksaws and its particular object is to provide a hacksaw in which the blade may be changed with the greatest ease and in which the angle-of the blade relative to the frame may be adjusted by merely pressing on a spring, whereby the tension of the blade is released and the same may be rotated in the frame to any desired degree. \Vhile in the drawing and in the following description I shall confine myself to the use of the termhacksaw I wish to have it understood that I do not confine myself thereby but wish to secure protection on the general structure, whether used in a hacksaw or in any similar tool used for similar purposes. I attain my object preferably by means of the mechanism illustrated in the accompanying drawing, in which Figure 1 is a side view of my hacksaw, Figure 2 an enlarged detail view of one of the holders for the blade of the saw, Figure 3 a vertical section through said holder along line 33 of Figure 2, Figure 4 anenlarged detail view of the other holder, Figure 5 a vertical section through said other holder along line 5-5 of Figure 4, Figure 6 an enlarged ,seetional view through the handle of my saw along line 66 of Figure 1, Figure 7 an enlarged detail end view of a pawl used for adjusting the tension of the saw, Figure 8 a side view of said pawl and Figure 9 an nlarged detail view of a rack on the handle adapted to be engaged by said pawl.

Referringto the drawing 1n detail it will be seen that the saw 1 consists of the handle 2, the frame 3 and the blade 6. The frame proper comprises two parts 7 and 8, the former being elbow-shaped and provided with a rack 9 at one end, while the latter is adaptpawl 11 engaging the rack 9. The free ends 12 and 14 of the frame are provided with axially alinedholes 16 and 17, the former being cylindrical, while the latter is coni cal, having its larger diameter at the outside of the frame. In the hole 16 is rota-.

being fulcrumed in the Specification of Letters Patent. Patented Apr. 18, 1922.

Application filed June 9,

1921. Serial No. 476,217.

v having-a head 21 at the outer end of the hole and an inner end 22 reduced to semicircular cross-section, from the base of which rises a small stud 23, which is slightly inclined outwardly and is adapted to engag a hole 24 at one'end of the blade. This end of the blade is secured in its position by a latch 26 supported in a slot 27 in the holder on the pin 28 and provided with two lateral projections 29 adapted to prevent the holder from slipping out of its hole when the saw blade is removed.

The hole 17 supports a sleeve 31 which forms an integral part of one member of the handle and furnishes a bearing for the second holder 32, which is shown in detail in Figures 4 and 5. This holder is similar to the holder 18 and consists of a rod 33 adapted to rotate in the sleeve 31, having a reduced end 34 with astud 36 adapted to receive the other end of the blade and a latch 37 to prevent the blade from jumping off the stud. The outer end of this holder is pivotally secured to the elbow of a bell crank lever 38 by the pin 39, the lever be- .co-operate with each other inadjusting the tension of the blade. It will be remembered that the yoke is integrally connected with the sleeve 31, which latter, being conical, is firmly braced against the frame. The lever, yoke and having its elbow pivotally connected to the blade, enables th operator to give the blade any desired tension -by pressing the long arm 43 of the lever into the yoke as will be readily understood from a glance at the-drawing.- The lever can be locked in any desired position by the pawl 44 pivotallysecured to its end and engaging the rack 46, the spring 47 holding the pawl in engagement with the rack, while an extension 48 of'the pawl provides a convenient means for the operator for liberating the pawl from its engage ment. 1 1

The use of this saw is very simple. To inse'rt the blade, first adjust the parts 7 and 8 with reference to each other so that the gap between the two holders corresponds somewhat with the length of the blade. Slip one end of the blade under the latch 26 so that its hole 24 registers with the stud 23, then press down on it. Place the hole in the other end of the blade over the stud 36 in the other holder and secure it by the latch 37. A mere pressure on the lever in the handle will then give the blade the proper tension and when the pressure is released, the pawl 44 engages the rack L6 and thereby locks the lever in that position. If it is desired to change the angle of the blade with reference to the saw, the tension of the blade may be released by a slight pressure on the extension -18 of the pawl 44 and the frame may be turned on the two holders as far as is desired.

To insure the holder at the far end of the saw against rotation while the saw is being used, I provide small projecting lugs 49 in' the frame portion 8 adapted to force themselv'esinto corresponding notches in the head of the said holder.

Various modifications and additions may be made to the device as shown in the drawing without affecting the spirit of the in- Vention.

I claim:

1. A saw comprising a frame having two bearings alined with each other, a handle rotating in and supported by one of the bearings, a saw blade supported in the handle and the other bearing so as to be normally rotatable, and means associated with the handle for stretching the blade whereby the handle and the blade are locked against rotation.

2. A saw comprising a frame having two bearings alined with each other, a handle rotating in and supported by one of the bearings, a saw blade supported in the handle and said means comprising a lever fulcrumed in the handle and pivotally engaging the blade for stretching the same.

3. A saw comprising a frame having two bearings alined with each other, a handle rotating in and supported by one of the bearings. a saw blade supported in the handle and the other bearing so as to be normally rotatable, and means associated with the handle for stretching the blade whereby the handle and the blade are locked against rotation, said means comprising a lever fulcrumed in the handle and pivotally engaging the end of the blade for stretching the same, a rack in the handle, a pawl pivotally secured in the lever adapted to engage the rack, and means for locking and releasing the pawl.

4. A saw comprising a frame having two bearings alined with each other, a handle rotating in and supported by one of the bearings. a saw blade supported in the handle and the other bearing so as to be normally rotatable, and means associated with the handle for stretching the blade whereby the handle and the blade are locked against rotation, said means comprising a lever fulcrumed in the handle and pivotally engaging the end of the blade for stretching the same, a rack in the handle, a pawl pivotally secured in the lever adapted to engage the rack, a spring adapted to lock the pawl in the rack and manual means for releasing the same.

GEORGE T. PARSLE Y. 

